import React, { useState } from 'react';
import { useLanguage } from '../LanguageContext';
import { apiService } from '../services/api';
import { Lock, User, Loader2, Languages, ArrowRight, ArrowLeftRight } from 'lucide-react';

interface LoginScreenProps {
  onLoginSuccess: (token: string, username: string) => void;
  onLoginError: (msg: string) => void;
}

const LoginScreen: React.FC<LoginScreenProps> = ({ onLoginSuccess, onLoginError }) => {
  const { t, language, setLanguage } = useLanguage();
  const [username, setUsername] = useState('');
  const [password, setPassword] = useState('');
  const [isLoading, setIsLoading] = useState(false);
  const [localError, setLocalError] = useState<string | null>(null);
  const [isLangMenuOpen, setIsLangMenuOpen] = useState(false);

  const handleLogin = async (e: React.FormEvent) => {
    e.preventDefault();
    setIsLoading(true);
    setLocalError(null);

    try {
      // Mock credentials: admin / password
      const response = await apiService.login({ username, password });
      
      if (response.status === 'success') {
        onLoginSuccess(response.data.token, response.data.username);
      } else {
        const errorMsg = response.message || t('auth.invalidCredentials');
        setLocalError(errorMsg);
        onLoginError(errorMsg);
      }
    } catch (err) {
      setLocalError(t('auth.invalidCredentials'));
    } finally {
      setIsLoading(false);
    }
  };

  return (
    <div className="min-h-screen flex flex-col items-center justify-center bg-[radial-gradient(ellipse_at_top,_var(--tw-gradient-stops))] from-gray-800 via-gray-900 to-black p-4">
      
      {/* Background decoration */}
      <div className="absolute top-0 left-0 w-full h-full overflow-hidden pointer-events-none z-0">
        <div className="absolute top-0 left-1/4 w-96 h-96 bg-plex-orange/10 rounded-full blur-[100px] opacity-20"></div>
        <div className="absolute bottom-0 right-1/4 w-96 h-96 bg-blue-500/10 rounded-full blur-[100px] opacity-20"></div>
      </div>

      {/* Language Switcher (Top Right) */}
      <div className="absolute top-6 right-6 z-20">
        <div className="relative">
          <button
            onClick={() => setIsLangMenuOpen(!isLangMenuOpen)}
            className="flex items-center space-x-2 px-3 py-2 rounded-lg bg-gray-800/50 hover:bg-gray-700/50 border border-gray-700 hover:border-gray-600 text-gray-300 transition-all backdrop-blur-sm"
          >
            <Languages size={16} />
            <span className="text-sm font-medium">{language === 'en' ? 'English' : 'Español'}</span>
          </button>
          
          {isLangMenuOpen && (
            <>
              <div className="fixed inset-0 z-10" onClick={() => setIsLangMenuOpen(false)}></div>
              <div className="absolute right-0 top-full mt-2 w-32 bg-gray-800 border border-gray-700 rounded-lg shadow-xl z-20 overflow-hidden animate-in fade-in slide-in-from-top-2">
                <button 
                  onClick={() => { setLanguage('en'); setIsLangMenuOpen(false); }}
                  className={`w-full px-4 py-2 text-sm text-left hover:bg-gray-700 transition-colors ${language === 'en' ? 'text-plex-orange font-bold' : 'text-gray-300'}`}
                >
                  English
                </button>
                <button 
                  onClick={() => { setLanguage('es'); setIsLangMenuOpen(false); }}
                  className={`w-full px-4 py-2 text-sm text-left hover:bg-gray-700 transition-colors ${language === 'es' ? 'text-plex-orange font-bold' : 'text-gray-300'}`}
                >
                  Español
                </button>
              </div>
            </>
          )}
        </div>
      </div>

      {/* Main Card */}
      <div className="w-full max-w-md bg-gray-900/60 backdrop-blur-xl border border-gray-700/50 rounded-2xl shadow-2xl p-8 z-10 animate-in zoom-in-95 duration-300">
        
        <div className="text-center mb-8 flex flex-col items-center">
           <div className="inline-flex items-center justify-center p-3 rounded-xl bg-gradient-to-br from-plex-orange to-yellow-600 shadow-lg shadow-plex-orange/20 mb-4">
              <ArrowLeftRight size={32} strokeWidth={2.5} className="text-gray-900" />
           </div>
           <h1 className="text-2xl font-bold tracking-tight text-white">
              <span className="text-plex-orange">PMS</span> Playlist Sync
           </h1>
        </div>

        <form onSubmit={handleLogin} className="space-y-4">
          
          {localError && (
             <div className="p-3 rounded-lg bg-red-500/10 border border-red-500/20 text-red-400 text-xs flex items-center justify-center">
               {localError}
             </div>
          )}

          <div className="space-y-1">
            <label className="text-xs font-semibold text-gray-500 uppercase tracking-wider ml-1">{t('auth.username')}</label>
            <div className="relative group">
              <div className="absolute inset-y-0 left-0 pl-3 flex items-center pointer-events-none">
                <User size={16} className="text-gray-500 group-focus-within:text-plex-orange transition-colors" />
              </div>
              <input
                type="text"
                value={username}
                onChange={(e) => setUsername(e.target.value)}
                className="w-full h-11 pl-10 pr-4 bg-gray-800/50 border border-gray-600 rounded-lg text-white placeholder-gray-500 focus:border-plex-orange focus:ring-1 focus:ring-plex-orange focus:outline-none transition-all"
                placeholder="admin"
              />
            </div>
          </div>

          <div className="space-y-1">
            <label className="text-xs font-semibold text-gray-500 uppercase tracking-wider ml-1">{t('auth.password')}</label>
            <div className="relative group">
              <div className="absolute inset-y-0 left-0 pl-3 flex items-center pointer-events-none">
                <Lock size={16} className="text-gray-500 group-focus-within:text-plex-orange transition-colors" />
              </div>
              <input
                type="password"
                value={password}
                onChange={(e) => setPassword(e.target.value)}
                className="w-full h-11 pl-10 pr-4 bg-gray-800/50 border border-gray-600 rounded-lg text-white placeholder-gray-500 focus:border-plex-orange focus:ring-1 focus:ring-plex-orange focus:outline-none transition-all"
                placeholder="password"
              />
            </div>
          </div>

          <button
            type="submit"
            disabled={isLoading || !username || !password}
            className={`w-full h-12 mt-6 rounded-lg text-sm font-bold flex items-center justify-center gap-2 transition-all shadow-lg
              ${isLoading 
                ? 'bg-gray-700 text-gray-400 cursor-not-allowed' 
                : 'bg-plex-orange text-gray-900 hover:bg-yellow-500 hover:shadow-plex-orange/30 active:scale-[0.98]'
              }`}
          >
            {isLoading ? (
              <>
                <Loader2 size={18} className="animate-spin" />
                <span>{t('auth.loggingIn')}</span>
              </>
            ) : (
              <>
                <span>{t('auth.loginBtn')}</span>
                <ArrowRight size={18} />
              </>
            )}
          </button>
        </form>

        <div className="mt-8 pt-6 border-t border-gray-700/50 text-center">
           <p className="text-[10px] text-gray-600">
             © PMS Playlist Sync
           </p>
        </div>
      </div>
    </div>
  );
};

export default LoginScreen;